#include <iostream>
using namespace std;
void swap(int &x, int &y) {
    int temp = x;
    x = y;
    y = temp;
}


int main() {
    int a, b;
    cin >> a >> b;
    cout << "Before swap: x=" << a << ", y=" << b << endl;
    swap(a, b);
    cout << "After swap: x=" << a << ", y=" << b << endl;

    return 0;
}